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Ford Fiesta Mk4 Si 1998 - Near side headlight problem  
Ford Fiesta Mk4 Si 1998 - Near side headlight problem - Sean.FezSi

Basically my near side headlight seems to be a lot dimmer than the off side one. At first I thought it was a duff bulb, but I checked them and they seemed fine (I even changed them and still the same result)

I have now noticed that the level adjuster is not working either (it points a lot higher than the other side, even if the other side is at its maximum)

I've checked the plug going to the unit itself and its secure. Could this be a bad earth? If so, where does the earth go to and how would I check it?

Regards

Sean

Tags: technical issues oil repairs

Ford Fiesta Mk4 Si 1998 - Near side headlight problem - Englishbullterrier

Have you measured the voltage at the headlight plug, with the headlights switched on ? Both earth and 2 x (+)12v will be supplied to the plug (dipped and main beam alternately).

.....ebt

Ford Fiesta Mk4 Si 1998 - Near side headlight problem - elekie&a/c doctor

When working on the headlights on these is a lot easier if you take it out.Lift up the grille ,undo screws and pull light forward.Unclip the back cover of the light and run another lead from the black wire of the headlight bulb direct to an earth point or battery.If this improves the situation then you have an earth fault.May be easier/quicker to run a new lead than find out where the fault is.hth

Ford Fiesta Mk4 Si 1998 - Near side headlight problem - Sean.FezSi

Thanks for the replies.

I haven't checked the voltage yet. I'll bring a multimeter and some cable home tomorrow. Taking the headlight out wont be problem, getting used to doing it now =).

If it does improve, how easy would it be to find out where the earth fault could be? Or is this like finding a needle in a haystack?

Also, how easy would it be to run a new earth, cant find my haynes manual to see the circuit diagrams. Is it a case of following the original loom from the headlight back?

Thanks again

Regards

Sean

Ford Fiesta Mk4 Si 1998 - Near side headlight problem - Englishbullterrier

As elekie&a/c doctor suggests, finding earth termination points can be a right pain. Manuals will normally only indicate where earthing points are common (in the wiring diagrams) but not necessarily the physical location.

Far easier (if it is an earthing issue) to simply run a wire from the rear of the lighting plug to a local earthing point.

Question you might want to ask yourself though is, are there any other circuits, possibly using this earthing point ? (It might be worth a cursory investigation following the harnes to see if you can see an earth termination point).......ebt

(ps, it'r pretty easy to create a new earthing point)

Edited by Englishbullterrier on 02/02/2011 at 10:57

Ford Fiesta Mk4 Si 1998 - Near side headlight problem - Sean.FezSi

thanks for replying again.

My nearside window does not go up or down, but thats been like it since before I bought the car (was the gf's) and I put that down to something being damaged when the glass was replaced after a break in, other than that, its the only circuit thats got a problem

Ford Fiesta Mk4 Si 1998 - Near side headlight problem - Englishbullterrier

Maybe you could update us when you've done some fault finding...

Ford Fiesta Mk4 Si 1998 - Near side headlight problem - Sean.FezSi

yeah I will, the weather wasn't the best today.

Ford Fiesta Mk4 Si 1998 - Near side headlight problem - Englishbullterrier

Any news ???.......ebt

Ford Fiesta Mk4 Si 1998 - Near side headlight problem - Englishbullterrier
Any any news ???
Ford Fiesta Mk4 Si 1998 - Near side headlight problem - Sean.FezSi

Sorry for the lengthy time since my last reply.

No news yet I'm afraid, haven't had much time to deal with it. I'll update you when I've checked it out

Ford Fiesta Mk4 Si 1998 - Near side headlight problem - Englishbullterrier

Cheers.....always nice to see an issue closed out and what the resolution was................ebt

Ford Fiesta Mk4 Si 1998 - Near side headlight problem - Englishbullterrier

Bump for resolution information ...

Ford Fiesta Mk4 Si 1998 - Near side headlight problem - Englishbullterrier

And the final resolution was ??????????????

Ford Fiesta Mk4 Si 1998 - Near side headlight problem - Sean.FezSi
Sorry for the very late reply, i've been busy with work/college and house moving duties. Finally got around to checking this problem last friday. Following instructions for checking if its an earth fault, it made no difference so i'm kind of stumped. Now the problem has changed. The headlight does not work at all now. I've checked the fuse and its fine, checked the bulb and its fine. Everything else in the unit works apart from the low beam.

Any more ideas? With my mot coming up I need to get this sorted. Again sorry for the time since my last reply.

Regards

Sean
Ford Fiesta Mk4 Si 1998 - Near side headlight problem - Sean.FezSi

Thanks again for the replies, turns out the new problem was in the unit its self, have replaced that now and all is well. Sorry for the late reply. You guys and gals are very helpful

Regards

Sean

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